Turtle shell - Turtle shell

Japanese: カメガイ(亀貝) - カメガイ
Turtle shell - Turtle shell
A general term for planktonic shellfish belonging to the Cavolinidae family, or one of these. Although they are snail shellfish, their shells are not coiled, but are thin and shaped like a turtle's shell. When alive, they swim with large, flat, lateral legs that look like wings on either side, hence the name "sea butterfly" or "pteropod." They are found in temperate and tropical waters around the world, and in Japan there are five species, including the largest of these, Cavolinia tridentata (illustration).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
カメガイ科Cavolinidaeに属する浮遊性貝類の総称,またはそのうちの1種を指す。巻貝類であるが殻は巻かず,薄い殻がカメの甲のような形をし,生きているときは左右に翼のような平たく大きい側足を出して泳ぐので,そのようすからカメガイ,または翼足類の名がある。また,英名ではsea butterflyと呼ばれる。世界の温・熱帯海域に分布し,日本にはこの類でもっとも大きいカメガイCavolinia tridentata(イラスト)のほか,5種が分布している。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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